24-21-00
 ALL  ú ú 01 Page 510 ú Mar 15/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (b)  
Make sure that the ac voltmeter shows 115 | 5 volts.

 (c)  
Make sure that the frequency shows 400 | 5 Hz.

 S 765-065
 (5)  
Look at the load on the two engine generators.

 (a)  
Look at the two engine generator ammeters.

 (b)  
Turn the left switch S2 on the M400 to A, then B, then C.

 (c)  
Make sure that the two engine generator ammeters show loads for all three switch positions.

 (d)  
Turn the left switch S2 to the B position.

 Q.
Do a Test of the Control Circuits for the Engine Generators.

 S 865-066
 (1)  Push the GEN 2 switch to OFF.
 (a)  Make sure that the BUS OFF No. 2 and GEN OFF BUS No. 2 lights come on.
 S 865-067
 (2)  Push the BUS TRANS switch to OFF.
 (a)  Make sure that the TRANSFER BUS OFF No. 2 light comes on.
 S 865-068
 (3)  Push the GEN 2 switch to ON.
 (a)  Make sure that these lights go off:
 1) GEN OFF BUS No. 2
 2) BUS OFF No. 2
 3) TRANSFER BUS OFF No. 2

 S 865-069
 (4)  Push the GEN 1 switch to OFF.
 (a)  Make sure that these lights come on:
 1) GEN OFF BUS No. 1
 2) BUS OFF No. 1
 3) TRANSFER BUS OFF No. 1

 S 865-070
 (5)  Push the BUS TRANS switch to AUTO.
 (a)  Make sure that the TRANSFER BUS OFF No. 1 light goes off.
 S 865-071
 (6)  
Push the GEN 1 switch to ON.

 (a)  Make sure that the BUS OFF No. 1 and GEN OFF BUS No. 1 lights go off.

 R.
Do a Power Transfer from the Engine Generators to the External Power.

 S 865-072
 (1)  Push the GRD PWR switch to ON.
 (a)  Make sure that the GEN OFF BUS No. 1 and GEN OFF BUS No. 2 lights come on.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 24-21-00
 ALL  ú ú 01 Page 511 ú Jul 15/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 S.

T.
U.
A
737-300/400/500MAINTENANCE MANUAL
Do a Power Transfer from the External Power to the Engine Generators.
 S 865-073
 (1)  Push the GEN 1 switch to ON.
 (a)  Make sure that the GEN OFF BUS No. 1 light goes off.
 S 865-074
 (2)  
Push the GEN 2 switch to ON.

 (a)
Make sure that the GEN OFF BUS No. 2 light goes off.Do a Power Transfer from the Engine Generators to the APU Generator.

 S 865-075

 (1)  
Push the APU GEN No. 1 switch to ON.

 (a)  
Make sure that the GEN OFF BUS No. 1 light comes on.

 (b)  
Make sure that the APU GEN OFF BUS light goes off.

 S 865-076
 (2)  
Push the APU GEN No. 2 switch to ON.

 (a)
Make sure that the GEN OFF BUS No. 2 light comes on.Put the Airplane Back to the Usual Configuration.

 S 865-077

 (1)  
Stop engines No. 1 and No. 2 (AMM 71-00-00/201).

 S 865-078

 (2)  
Remove the electrical loads from the ac buses.

 (a)  
Remove power from the lights, galleys, air conditioning, and fuel boost pumps.

 (b)  
Push the HYD PUMPS - ELEC 1 and 2 switches to OFF.

 S 865-079
 (3)  
Stop the APU (AMM 49-11-00/201).

 S 865-080

 (4)  
Push the BAT switch to OFF.

 S 865-103
 WARNING: BEFORE YOU REMOVE THE EXTERNAL POWER CABLE, MAKE SURE THAT IT
_______ IS NOT ENERGIZED. IF THE EXTERNAL POWER CABLE IS ENERGIZED WHEN YOU REMOVE IT, ELECTRICAL ARCS AND SHOCK CAN OCCUR. ELECTRICAL SHOCK CAN CAUSE INJURY TO PERSONS. ELECTRICAL ARCS CAN CAUSE DAMAGE TO EQUIPMENT.
 (5)  
Remove power from the external power cable.

 S 095-082

 (6)  
Remove the external power cable from the external power receptacle P19.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
　
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